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Cardiovascular system - key terms

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Across:
2. When an athlete's aerobic fitness improves, so the number of these increases.
4. Housed by a particular type of cell, when muscles demand more oxygen, this substance carries it
5. Number of beats per minute (bpm)
6. Another word for network of blood vessels
7. Another word for heart and often precedes the word "....vascular"
8. Measured in mmhg, 120 systollic and 80 diastollic represents an average adult reading of this

Down:
1. Volume of blood ejected from the heart in one minute
3. Volume of blood ejected from the heart in one beat